<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">
        姓氏:<input type="text" v-model="surnames"><br>
        名字:<input type="text" v-model="theName"><br>
        全名:{{fullName}}
        <button @click="count++">修改{{count}}</button> <br>
        {{sayHello}}
    </div>
    <script>
        const vm = new Vue({
            el: '#app',
            data() {
                return {
                    count: 0,
                    surnames: '',
                    theName: '',
                }
            },
            computed: {
                fullName() {
                    console.log("FullName计算属性 重新计算了");
                    return this.surnames + '-' + this.theName
                },
                sayHello() {
                    return this.fullName + '123'
                }
            }

        })
    </script>
</body>

</html>